MUMUP-1207 : Marketplace rating on /web

### New Button on marketplace entry
![image](https://cloud.githubusercontent.com/assets/3534544/5091497/db12cd7c-6f0e-11e4-92cb-092e2f365661.png)

### Modal Popup with rating/review
![image](https://cloud.githubusercontent.com/assets/3534544/5091519/f30c8710-6f0e-11e4-80f0-26a69e6cf363.png)

### Modal Popup with already rated/reviewed content

![image](https://cloud.githubusercontent.com/assets/3534544/5091538/13d95ae0-6f0f-11e4-9640-6b6554c77e9f.png)

### Notes
+ Utilizes `bootstrap-u`i component for `$modal`
+ Uses `$http.post` to save (first)

### Room for improvement. 
+ I don't love the button style, but didn't want to hack something together.
+ The rating number count doesn't increase after you save. It could be neat if it +1'd on save.